[TabBar] Don't draw base. Should help with Qt5 Fusion style

Also small changes in MainApplication

src/lib/app/mainapplication.cpp

@@ -270,6 +270,9 @@ MainApplication::~MainApplication()
 {
     // Delete all classes that are saving data in destructor
     delete m_bookmarks;
+    delete m_cookieJar;
+
+    IconProvider::instance()->saveIconsToDatabase();
 }
 
 bool MainApplication::isClosing() const
@@ -729,7 +732,6 @@ void MainApplication::saveSettings()
 
     qzSettings->saveSettings();
     AdBlockManager::instance()->save();
-    IconProvider::instance()->saveIconsToDatabase();
     QFile::remove(DataPaths::currentProfilePath() + QLatin1String("/WebpageIcons.db"));
     Settings::syncSettings();
 }

src/lib/webview/tabbar.cpp

@@ -55,13 +55,13 @@ TabBar::TabBar(BrowserWindow* window, TabWidget* tabWidget)
     setObjectName("tabbar");
     setContextMenuPolicy(Qt::CustomContextMenu);
     setElideMode(Qt::ElideRight);
-    setDocumentMode(true);
     setFocusPolicy(Qt::NoFocus);
     setTabsClosable(false);
     setMouseTracking(true);
-    setMovable(true);
-
+    setDocumentMode(true);
     setAcceptDrops(true);
+    setDrawBase(false);
+    setMovable(true);
 
     connect(this, SIGNAL(currentChanged(int)), this, SLOT(currentTabChanged(int)));
     connect(this, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(contextMenuRequested(QPoint)));